<template>
  <div>
        <!-- 面包屑导航 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false"></el-alert>
            <el-steps 
            :space="200" 
            :active="activeIndex - 0" 
            finish-status="success"
            align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- 与步骤使用一个数据项 activeIndex  -->
            <el-form    
            :model="addForm" 
            :rules="addFormRules" 
            ref="addFormRef" 
            label-width="100px"
            label-position="top">
                <el-tabs :tab-position="'left'" 
                :before-leave="beforeTabLeave" 
                v-model="activeIndex" 
                @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"> </el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"> </el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight"  type="number"> </el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number"  type="number"> </el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                            expand-trigger="hover"
                            v-model="addForm.goods_cat"
                            :options="cateList"
                            :props="cateProps"
                            @change="handleChange"></el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1"> 
                        <!-- ！渲染表单的Item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id"> 
                             <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb,index) in item.attr_vals" :key="index"></el-checkbox>
                                <!-- <el-checkbox label="复选框 B"></el-checkbox>
                                <el-checkbox label="复选框 C"></el-checkbox>
                                <el-checkbox label="禁用" disabled></el-checkbox>
                                <el-checkbox label="选中且禁用" disabled></el-checkbox> -->
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableData" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <!-- action 代表图片上传的后台API地址 -->
                    <el-tab-pane label="商品图片" name="3">
                        <el-upload
                        :action="uploadURL" 
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        :headers="headerObj"
                        :on-success="handleSuccess"
                        list-type="picture">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <el-button type="primary" @click="add" style="margin-top:15px">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>

        <!-- 图片展示对话框 -->
        <el-dialog
        title="图片预览"
        :visible.sync="previewVisible"
        width="30%"
        >
            <img :src="previewPath" alt="" class="previewImg">
        </el-dialog>
    </div>
</template>

<script>
import _ from 'lodash'
export default {
    data(){
        return {
            activeIndex:'0',
            //商品表单数据
            addForm:{
                goods_name:'', // 商品名字
                goods_price:0, // 商品价格
                goods_weight:0, // 商品重量
                goods_number:0, // 商品数量
                goods_cat:[],// 商品所属分类的数组
                pics:[], // 图片的数组
                goods_introduce:'', // 商品的详情描述
                attrs:[]
            },
            // 商品分类数据
            cateList:[],  
            cateProps:{
                label:'cat_name', // 看到的属性
                value:'cat_id', // 实际选中的值
                chlidren:'chlidren'
            },
            
            // 动态参数列表
            manyTableData:[],
            // 静态参数列表
            onlyTableData:[],
            // 添加商品规则
            addFormRules:{
                goods_name:[
                    {required:true,message:"请输入商品名称",trigger:'blur'},
                ],
                goods_price:[
                    {required:true,message:"请输入商品价格",trigger:'blur'},
                ],
                goods_weight:[
                    {required:true,message:"请输入商品重量",trigger:'blur'},
                ],
                goods_number:[
                    {required:true,message:"请输入商品数量",trigger:'blur'},
                ],
                goods_cat:[
                    {required:true,message:"请选择商品分类",trigger:'blur'},
                ]
            },
            
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',// 图片上传地址
            // 图片上传组件信息
            headerObj:{
                Authorization:window.sessionStorage.getItem('token')
            },
            // 图片URL地址
            previewPath:'',
            // 图片对话框隐藏与显示
            previewVisible:false
            
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status !==200){
                return this.$message.error('获取商品分类数据失败')
            }
            this.cateList = res.data
            console.log(this.cateList);
        },
        // 级联选择器选中变化，触发函数
        handleChange(){
            console.log(this.addForm);
            // 控制选择范围
            if(this.addForm.goods_cat.length !==3){
                this.addForm.goods_cat = []
            }
        },
        // 切换标签页钩子函数
        beforeTabLeave(activeName,oldActiveName){
            console.log('即将离开的标签页',oldActiveName);
            console.log('即将进入的标签页',activeName);
            if(oldActiveName === '0' && this.addForm.goods_cat.length!==3){
                this.$message.error('请先选择商品分类')
                return false
            }
            
        },
        async tabClicked(){
            // console.log('激活',this.activeIndex);
            // 动态参数面板
            if(this.activeIndex === '1'){
                console.log('动态参数面板');
                const {data:res} = await this.$http.get(`categories/${this.cardId}/attributes`,{params:
                    {sel:'many'}
                })
                if(res.meta.status !== 200){
                    return this.$message.error('获取动态参数失败')
                }
                console.log(res.data);
                res.data.forEach(item => {
                    item.attr_vals=
                    item.attr_vals.length===0?[]:item.attr_vals.split(' ')
                }) 

                this.manyTableData = res.data
                
            } else if(this.activeIndex === '2'){
                console.log('静态参数面板');
                const {data:res} = await this.$http.get(`categories/${this.cardId}/attributes`,{params:
                    {sel:'only'}
                })
                 if(res.meta.status !== 200){
                    return this.$message.error('获取静态态参数失败')
                }
                console.log(res.data);
                this.onlyTableData = res.data
            }
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file);
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作 
        handleRemove(file){
            // 1. 获取将要删除的图片的临时路径
            console.log("移除图片的信息",file);
            const filePath = file.response.data.tmp_path

            // 2. 从pics数组中华，找到这个图片索引值
            const i = this.addForm.pics.findIndex(x => x.pic===filePath)

            // 3. 调用数组的splice方法，把图片信息对象，从数组中移除
            this.addForm.pics.splice(i,1)
            console.log(this.addForm);

        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            // console.log(response);
            // 1.拼接得到一个图片信息对象
            const picInfo = {pic:response.data.tmp_path}
            // 2.将图片信息 push 到 pics
            this.addForm.pics.push(picInfo)
            console.log(this.addForm);
        },
        add(){ 
            // 校验
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid){ 
                    return this.$message.error('请填写完必要的表单数据')
                }
            
                // 执行添加的业务逻辑
                // 但是级联选择关联的数据是数组
                // 所以我们采用深拷贝的方法解决 lodash 
                const form = _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item=>{
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableData.forEach(item=>{
                    const newInfo = {attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs = this.addForm.attrs
                console.log('form',form);
                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const {data:res} = await this.$http.post('goods',form)     
                if(res.meta.status !== 201){
                    console.log('res',res);
                    
                    return this.$message.error('添加商品失败')
                }
                this.$message.success('添加商品成功')
                this.$router.push('/goods')
            })
        }    

    },
    computed:{
        cardId(){
           if(this.addForm.goods_cat.length === 3){
               return this.addForm.goods_cat[2]
           }
           return null
        }
    }
}
</script>

<style lang='less' scoped>
    .el-checkbox{
        margin: 0 5px 0 0 !important;
    }
    .previewImg{
        width: 100%;
    }
</style> 